hello world

kernel/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "kernel"
+version = "0.1.0"

kernel/Cargo.toml

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+[package]
+name = "kernel"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

kernel/src/main.rs

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+#![no_std]
+#![no_main]
+
+#![feature(lang_items)]
+
+#[lang = "eh_personality"]
+extern "C" fn eh_personality() {}
+
+use core::panic::PanicInfo;
+use core::sync::atomic;
+use core::sync::atomic::Ordering;
+
+
+#[inline(never)]
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {
+        atomic::compiler_fence(Ordering::SeqCst);
+    }
+}
+
+
+mod terminal;
+
+use terminal::{fill, put_string, VgaColor};
+
+#[no_mangle]
+fn main() -> ! {
+    fill(' ', VgaColor::BLACK, VgaColor::BLACK);
+    put_string(0, 0, "Hello World from MxRox!", VgaColor::BLACK, VgaColor::WHITE);
+
+    loop {}
+}

kernel/src/terminal.rs

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+pub const TERMINAL_BUFFER: *mut u16 = 0xB8000 as *mut u16;
+pub const TERMINAL_WIDTH: usize = 80;
+pub const TERMINAL_HEIGHT: usize = 25;
+
+pub struct VgaColor(u8);
+
+impl VgaColor {
+    pub const BLACK: u8 = 0;
+    pub const BLUE: u8 = 1;
+    pub const GREEN: u8 = 2;
+    pub const CYAN: u8 = 3;
+    pub const RED: u8 = 4;
+    pub const MAGENTA: u8 = 5;
+    pub const BROWN: u8 = 6;
+    pub const LIGHT_GREY: u8 = 7;
+    pub const DARK_GREY: u8 = 8;
+    pub const LIGHT_BLUE: u8 = 9;
+    pub const LIGHT_GREEN: u8 = 10;
+    pub const LIGHT_CYAN: u8 = 11;
+    pub const LIGHT_RED: u8 = 12;
+    pub const LIGHT_MAGENTA: u8 = 13;
+    pub const LIGHT_BROWN: u8 = 14;
+    pub const WHITE: u8 = 15;
+}
+
+pub fn put_char(x: usize, y: usize, c: char, bg: u8, fg: u8) {
+    let c16 = c as u16;
+    let color = fg | bg << 4;
+    let color16 = color as u16;
+    let index = y * TERMINAL_WIDTH + x;
+
+    unsafe {
+        *TERMINAL_BUFFER.add(index) = c16 | (color16 << 8)
+    }
+}
+
+pub fn put_string(x: usize, y: usize, text: &str, bg: u8, fg: u8) {
+    for (i, c) in text.char_indices() {
+        put_char(x+i, y, c, bg, fg);
+    }
+}
+
+pub fn fill(c: char, bg: u8, fg: u8) {
+    for x in 0..TERMINAL_WIDTH {
+        for y in 0..TERMINAL_HEIGHT {
+            put_char(x, y, c, bg, fg);
+        }
+    }
+}

kernel/x86-unknown-bare_metal.json

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+{
+    "llvm-target": "i686-unknown-none",
+    "data-layout": "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-i128:128-f64:32:64-f80:32-n8:16:32-S128",
+    "arch": "x86",
+    "target-endian": "little",
+    "target-pointer-width": "32",
+    "target-c-int-width": "32",
+    "os": "none",
+    "executables": true,
+    "linker-flavor": "ld.lld",
+    "linker": "rust-lld",
+    "panic-strategy": "abort",
+    "disable-redzone": true,
+    "features": "+soft-float,-sse"
+  }
+